Question

A car accelerates from rest for 5 seconds until it reaches a speed of 20 m/s. what is the car's acceleration in meters per second per second?

Answer 1

since it starts from rest, the initial velocity is 0 m/s. final velocity is 20 m/s.
a=Vfinal-Vinitial/t
a=20m/s-0m/s/5s
a=4 m/s^2